hey guys, need a little help here. i have a 2002 mazda tribute with approx 150,000 miles on it. I noticed while driving down highway the engine starts to hesitate and stumble and the check engine light will start blinking but then goes off, then comes back on. Once I let off the gas or give it more gas the engine will stop hesitating or stumbling and be fine. My dad is very handy with cars but were stumped here. We just checked all the plugs and checked all the coils so they're good. Tomorrow we're going to clean the idle air control valve.
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I was reading it could be "The DPFE (differential pressure feedback EGR) sensor tends to fail. The DPFE sensor monitors function of the EGR valve by measuring pressure changes in the exhaust gas recirculation (EGR) system. Symptoms of a failing DPFE sensor are hesitation or stumbling when driving along with illumination of the Check Engine Light."
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HAS ANYONE HAD SIMILIAR ISSUES OR KNOW WHERE TO START? I have to drive 40 miles each way to work and would hate to spend $ on a newer vehicle when its going to get worked.

 

A blinking check engine light is misfire, typically from bad plugs, coils. If you haven't changed the ign coils with 150,000 miles change them. They can't be trusted.
While you're there, clean the MAF, throttle body and EGR valve.

 

Will do